Java Super Keyword

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In Java language, the super keyword is used to invoke the base class constructor or method or instance variable.

Syntax:

 super;

Example:-

To invoke the base class instance variable using super keyword.

 class A
{
	int a=10;
    void showdata()
    {
    	System.out.println("Base class a value: "+ a);
    }
}
class B extends A
{
	int a=5;
	void showdata()
    {	// super invoke the a value from base class
    	System.out.println("Derived class a value: "+ super.a);
    }
}
public class Supermethod
{  
	public static void main(String args[])
    {  
	    B b= new B();
        b.showdata();
	}   
}
Run ›

Example:-

To invoke the base class method using super keyword.

 class A
{
	int a=10;
    void showdata()
    {
    	System.out.println("Base class a value: "+ a);
    }
}
class B extends A
{
	int a=5;
	void showdata()
    {
    	super.showdata();// super invoke the method from base class
    	System.out.println("Derived class a value: "+ a);
    }
}
public class Supermethod
{  
	public static void main(String args[])
    {  
	    B b= new B();
        b.showdata();
	}   
}
Run ›

Example:-

To invoke the base class constructor using super keyword.

 class A
{
	int a=10;
    A()
    {
    	System.out.println("Base class a value: "+ a);
    }
}
class B extends A
{
	int a=5;
	B()
    {
    	super();
    	System.out.println("Derived class a value: "+ a);
    }
}
public class Superconstructor
{  
	public static void main(String args[])
    {  
	    B b= new B();
	}   
}
Run ›
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